Display info from associated fields breaks the input page

I have a dropdown in an input form that displays options from an associated collection (similar to tasks and users in the tutorial). So the user selects an existing Project, and creates a new task belonging to that project. I would like to show the corresponding date, and project number on the input screen but whenever I do this, the Project number is not registered in the record. If I leave out the associated info. The new task including the Project number is saved along with the record. Is there a way to see info from an associated collection when doing an input form?

Please provide screenshots and the data table structure to help explain your problem.